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MISC (Minimal Instruction Set Computer) is a processor architecture with a very small number of basic operations and corresponding opcodes. Such instruction sets are commonly stack based rather than register based to reduce the size of operand specifiers. Such an architecture is inherently simpler since all instructions operate on the top most stack entries. A result of this is a smaller intruction set, a smaller and faster instruction decode unit, and overall faster operation of individual instructions. The downside is that instructions tend to have more sequential dependencies, reducing instruction-level parallelism. MISC architectures have a lot in common with the Forth language, and the Java Virtual Machine.
Probably the most commerically successful MISC was the INMOS transputer.
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